Hey Wayne, the photo posted today of your 1977 Pi 1 shows horn that looks a lot like the one in my Hitachi Ls-500 system. What were you using then? tdc
I can't be sure its the same tweeter since its marked Hitachi in the Ls-500 used with a 8 inch l-205 woofer (copy of JBL 8). Looks like some Japanese designer thinks like you do. tdc